RECON: TNO occultation with 471272

Event between (471272) 11FY9 and star UC4-397-056202 with event index number of 145081

Geocentric closest approach at 2018/05/22 13:06:15 UTC

J2000 position of star is 14:24:15.2 -10:46:05
Equinox of date position of star is 14:25:09.0 -10:50:35
Stellar brightness R=12.9
Star is 61 degrees from the moon. Moon is 54% illuminated.
TNO apparent brightness V=21.7

TNO is 20.1 AU from the Sun and 19.1 AU from the Earth.
The TNO is moving 21.3 km/sec on the sky relative to the star, or, 5.5 arcsec/hr.
The 1-sigma error in the time of the event is 179 seconds.
The 1-sigma cross-track error in the shadow position is 2733 km.

The TNO has an absolute magnitude Hv=8.6
Diameter=114.8 km assuming a 5% albedo -- 5.4 sec chord
Diameter=46.9 km assuming a 30% albedo -- 2.2 sec chord
Dynamical classification is CENTAURR
 
 
 
 
 
 
 
 

Star training set for 471272, (2018/05/22 13:06UT)
Object            RA         Dec     mag  sep  mel
Spica          13:26:09.9 -11:15:24  1.0 14.50  48
27Bet Lib      15:18:00.0 -09:26:59  2.6 13.06  73
2 Lib          14:24:25.2 -11:47:50  6.2  0.97  61
PPM 228674     14:22:48.5 -10:45:00  8.2  0.61  60
PPM 228737     14:25:14.0 -10:52:59  9.5  0.03  61
471272         14:25:14.6 -10:51:03 12.9        61
Positions are for equinox of date

Azimuth is measured in degrees eastward from north. North is at an azimuth of 0, due East is at an azimuth of 90 degrees, due South is 180, and due West is 270.

Do not use the listing below for the RECON CPC 1100 telescopes. This is provided for other non-team facilities.

Star training set for 471272, (2018/05/22 13:06UT)
Object            RA         Dec     mag  sep  mel
Spica          13:25:11.5 -11:09:41  1.0 14.50  48
27Bet Lib      15:17:00.3 -09:22:59  2.6 13.06  73
2 Lib          14:23:25.6 -11:42:52  6.2  0.97  61
PPM 228674     14:21:49.2 -10:40:01  8.2  0.61  60
PPM 228737     14:24:14.7 -10:48:01  9.5  0.03  61
471272         14:24:15.2 -10:46:05 12.9        61
Positions are for J2000

Event circumstances last updated at 2016/09/01 18:26:14 UT

Marc W. Buie, Southwest Research Institute

RECON